Invalid HTTP request received.

[madsurgeon]

Hi

I have just installed paperless-ngx using the installation script ona headless server.
The installation went smoothly, and I don't see any errors in the logs.
And yet, on port 8000 I get the error message "Invalid HTTP request received."
When I try opening the website in the console using 'curl http://localhost:8000' no output is generated at all.
How can I find the cause?

Thanks

[shamoon]

There's not a lot of information to go off here, if you're using the installation script presumably you're using docker. In which case there should be logs of some kind to look at. Could be anything from services not running to networking issues. Again, really not a lot of information to go off here, please provide what you can...

[madsurgeon]

Thank you for your quick reply.
Yes, I have installed using docker with the automatic installation script.
The last logs as of now just show its activity in the background (using docker logs ...):
[2023-02-23 08:50:00,055] [INFO] [celery.beat] Scheduler: Sending due task Check all e-mail accounts (paperless_mail.tasks.process_mail_accounts)
[2023-02-23 08:50:00,061] [INFO] [celery.worker.strategy] Task paperless_mail.tasks.process_mail_accounts[b3e85f29-9123-4a4e-b257-db000af2bc1d] received
[2023-02-23 08:50:00,110] [INFO] [celery.app.trace] Task paperless_mail.tasks.process_mail_accounts[b3e85f29-9123-4a4e-b257-db000af2bc1d] succeeded in 0.044531166553497314s: 'No new documents were added.'
I can also see port 8000 open:
ubuntu@paperless:~$ netstat -tlpen | grep 8000
(Not all processes could be identified, non-owned process info will not be shown, you would have to be root to see it all.)
tcp 0 0 0.0.0.0:8000 0.0.0.0:* LISTEN 0 85768518 -
tcp6 0 0 :::8000 :::* LISTEN 0 85765049 -
However, curl returns nothing:
ubuntu@paperless:~$ curl http://localhost:8000
ubuntu@paperless:~$
And as I said before, when accessing it through a web browser, I get the error message "Invalid HTTP request received.".
I was also looking for logs from the web server in the docker container but couldn't find any.

[shamoon]

Hmm, never seen this one before. Have you tried starting over, either with the script or directly with docker? I wonder if something in your configuration was set wrong during the setup via install script

[madsurgeon]

I have found the reason for this behavior. It had nothing to do with paperless.
I have installed it inside a LXD container and defined the proxy with proxy_protocol=true. Without this option it works fine.

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